EP2045452B1 - Cooling controller of internal combustion engine - Google Patents
Cooling controller of internal combustion engine Download PDFInfo
- Publication number
- EP2045452B1 EP2045452B1 EP07790595.8A EP07790595A EP2045452B1 EP 2045452 B1 EP2045452 B1 EP 2045452B1 EP 07790595 A EP07790595 A EP 07790595A EP 2045452 B1 EP2045452 B1 EP 2045452B1
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- EP
- European Patent Office
- Prior art keywords
- engine
- starting
- stopping
- cylinder
- initiation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000002485 combustion reaction Methods 0.000 title claims description 91
- 238000001816 cooling Methods 0.000 title claims description 83
- 230000006835 compression Effects 0.000 claims description 72
- 238000007906 compression Methods 0.000 claims description 72
- 230000000977 initiatory effect Effects 0.000 claims description 66
- 239000002826 coolant Substances 0.000 claims description 47
- 238000004880 explosion Methods 0.000 claims description 47
- 238000007664 blowing Methods 0.000 claims description 9
- 239000000446 fuel Substances 0.000 description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 25
- 238000002347 injection Methods 0.000 description 19
- 239000007924 injection Substances 0.000 description 19
- 238000000034 method Methods 0.000 description 8
- 239000007858 starting material Substances 0.000 description 6
- 238000013459 approach Methods 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
- F01P5/12—Pump-driving arrangements
- F01P2005/125—Driving auxiliary pumps electrically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/60—Operating parameters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2031/00—Fail safe
- F01P2031/30—Cooling after the engine is stopped
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
- F01P7/048—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using electrical drives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
- F02D41/065—Introducing corrections for particular operating conditions for engine starting or warming up for starting at hot start or restart
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/005—Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation
- F02N2019/008—Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation the engine being stopped in a particular position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
- F02N2200/021—Engine crank angle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
- F02N2200/023—Engine temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/06—Parameters used for control of starting apparatus said parameters being related to the power supply or driving circuits for the starter
- F02N2200/061—Battery state of charge [SOC]
Definitions
- the present invention relates to a cooling control apparatus of an internal combustion engine.
- a typical internal combustion engine first burns fuel in a cylinder in which the first compression stroke after the initiation of starting of the engine takes place or in a cylinder in which the second compression stroke after the initiation of starting of the engine takes place, so that the initial explosion after the initiation of starting of the engine takes place during the compression stroke.
- the cylinders are respectively stopped at initial stages of an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke. Therefore, at the completion of stopping of the engine, the cylinder in which the first compression stroke takes place after subsequent the initiation of starting of the engine is the cylinder that is stopped at the initial stage of the compression stroke, and the cylinder in which the second compression stroke takes place after subsequent the initiation of starting of the engine is the cylinder that is stopped at the initial stage of the intake stroke.
- the cylinder in which the first compression stroke after starting of the engine takes place and the cylinder in which the second compression stroke after the initiation of starting of the engine takes place are respectively in the initial stage of the compression stroke and the initial stage of the intake stroke while the engine is stopped, gas that has remained in the combustion chambers while the engine has been stopped is compressed after the initiation of starting of the engine. If the engine is started without taking enough time for cooling after stopping of the engine is completed, the first compression stroke and the second compression stroke take place in a state where the temperature of gas in the combustion chambers are increased by the heat of the engine. Thus, during those compression strokes, the temperature of gas in the combustion chambers is high. This might cause self-ignition (pre-ignition) of the fuel in the combustion chambers.
- the engine is often restarted without taking enough time for cooling after stopping of the engine.
- the above-mentioned pre-ignition there is more possibility for the above-mentioned pre-ignition to occur.
- the pressure in the combustion chamber takes a lower value (negative pressure) than the atmospheric pressure, and air is drawn in from the intake passage to the combustion chamber.
- the intake valve is closed while the piston moves in the direction to expand the combustion chamber, and the piston shifts to the compression stroke.
- the pressure in the combustion chamber takes a lower value (negative pressure) than the atmospheric pressure. Therefore, in the cylinder that is stopped at the initial stage of the compression stroke and the cylinder that is stopped at the initial stage of the intake stroke at the completion of stopping of the engine, the pressure in the combustion chamber takes a lower value than the atmospheric pressure.
- pre-ignition might occur if the engine is started without taking enough time for cooling after stopping of the engine is completed.
- Patent Document 1 discloses a cooling apparatus that is driven by a driving source different from the internal combustion engine and cools the engine with coolant. If the coolant temperature that takes a value corresponding to the engine temperature is higher than a predetermined value at the completion of stopping of the engine, the cooling apparatus is driven until the coolant temperature becomes less than the predetermined value while the engine is stopped. In this case, since the engine temperature is reduced while the engine is stopped by setting the predetermined value to a low value, pre-ignition is suppressed at the subsequent initiation of starting of the engine. However, to reliably suppress the pre-ignition, the predetermined value needs to be set appropriately.
- the predetermined value is set so as to reduce the engine temperature while the engine is stopped to a value at which pre-ignition does not occur when starting of the engine is initiated. In this manner, the pre-ignition the initiation of starting of the engine is reliably avoided.
- the predetermined value is set as described above, if the piston position in the cylinder when stopping of the engine is completed is at a position closer to the top dead center than the position closest to the bottom dead center, the engine is cooled more than necessary in suppressing the occurrence of pre-ignition. This is because, when the piston position is at the position closer to the top dead center, the temperature of gas and the pressure in the combustion chamber is low during the compression stroke when the initial explosion takes place after the initiation of starting of the engine, compared to a case where the piston position is at the position closer to the bottom dead center. Thus the possibility for the pre-ignition to occur is reduced.
- Patent Document 1 Japanese Laid-Open Patent Publication No. 2001-182580 .
- US 6 986 331 B2 is also aiming to avoid pre-ignition.
- a cooling control apparatus is provided that is applied to an internal combustion engine that includes cylinders provided with pistons, and in which initial explosion takes place in one of a first compression stroke and a second compression stroke after the initiation of starting of the engine.
- the cooling control apparatus includes a cooling apparatus, a control section, and a setting section.
- the cooling apparatus is driven by a driving source different from the engine and cools the engine.
- the control section drives the cooling apparatus at and after the completion of stopping of the engine and when the engine temperature is greater than or equal to a predetermined value that might cause pre-ignition at starting of the engine.
- the setting section sets the predetermined value in accordance with the crank angle at the completion of stopping of the engine.
- the setting section sets the predetermined value to a value higher than that in a case where the crank angle at the completion of stopping of the engine is a crank angle at which the piston position of the cylinder in which the initial explosion takes place after the subsequent initiation of starting of the engine is closer to the bottom dead center.
- An engine 1 shown in Fig. 1 is an in-line four-cylinder engine that is mounted on an automobile and is automatically stopped and restarted.
- fuel is injected from fuel injection valves 2 to corresponding combustion chambers 3 during operation.
- pistons 4 reciprocate, thereby rotating a crankshaft 5, which is an output shaft of the engine 1.
- the rotation of the crankshaft 5 is transmitted to a camshaft 6, for example, by a belt.
- the rotation of the camshaft 6 selectively opens and closes engine valves such as intake valves 7 and exhaust valves 8.
- a combustion cycle including an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke is repeated.
- the intake stroke, compression stroke, expansion stroke, and exhaust stroke are performed in the order of a first cylinder, a third cylinder, a fourth cylinder, and a second cylinder (refer to Fig. 2 ).
- fuel is injected from the fuel injection valves 2 to the combustion chambers 3 in a state where the crankshaft 5 is forced to rotate (cranking) by driving a starter 15 coupled to the crankshaft 5.
- a rotor 9 made of a magnetic body is secured to the crankshaft 5 of the engine 1, and protrusions 9a are formed on the periphery of the rotor 9 at equal intervals in the circumferential direction.
- two crank position sensors 11, 12 are provided in the vicinity of the rotor 9.
- signals corresponding to the protrusions 9a are output from the crank position sensors 11, 12.
- devices are used that can output pulse signals corresponding to the protrusions 9a even when the rotation speed of the rotor 9 is extremely slow such as immediately before stopping of the engine 1 is completed.
- magnetoresistive element (MRE) sensors are used.
- the relative positions of the crank position sensor 11 and the crank position sensor 12 with respect to the circumferential direction of the rotor 9 are set such that the phases of the pulse signals output from the sensors 11, 12 are displaced from each other.
- a rotor 13 made of a magnetic body is secured also to the camshaft 6, and protrusions 13a having different circumferential length from one another are formed on the periphery of the rotor 13 at different intervals in the circumferential direction.
- a cam position sensor 14 is provided in the vicinity of the rotor 13. When the rotor 13 is rotated with the camshaft 6, signals corresponding to the protrusions 13a of the rotor 13 are output from the cam position sensor 14.
- a device is used that can output pulse signals corresponding to the protrusions 13a even when the rotation speed of the rotor 13 is extremely slow such as immediately before stopping of the engine 1 is completed.
- a magnetoresistive element (MRE) sensor that is the same as the crank position sensors 11, 12 is used.
- the crank angle of the engine 1 is acquired. Since, as the sensors 11, 12, 14, the MRE sensors, which can output pulse signals corresponding to the protrusions 9a, 13a of the rotors 9, 13 even immediately before stopping of the engine 1, are used, the crank angle is reliably acquired even immediately before stopping of the engine 1 is completed. Therefore, based on the pulse signals from the crank position sensors 11, 12, and the pulse signal from the cam position sensor 14, the crank angle of the engine 1 at the completion of stopping of the engine 1 is acquired.
- the cooling apparatus for cooling the engine 1 will now be described.
- the cooling apparatus is provided with a circulation passage 16 for letting a coolant to flow to the engine 1.
- An electric water pump 17 and a radiator 18 are provided in the circulation passage 16, and an electric cooling fan 19 is provided in the vicinity of the radiator 18.
- the electric water pump 17 and the electric cooling fan 19 are driven by a motor through power supply from a battery 20 of the automobile, that is, by a driving source different from the engine 1.
- the coolant in the circulation passage 16 starts to flow, and the coolant circulates in the circulation passage 16 passing through the radiator 18 and the engine 1.
- the coolant is cooled by heat exchange with the external air when passing through the radiator 18.
- the electric cooling fan 19 is driven and air is blown toward the radiator 18, heat exchange between the coolant and the external air at the radiator 18 is promoted.
- the coolant cooled by the radiator 18 draws heat by heat exchange with the engine 1 when passing through the engine 1, thereby cooling the engine 1.
- the cooling efficiency of the engine 1 by the cooling apparatus is increased as the flow rate of the electric water pump 17 is increased to increase the amount of the coolant passing through the engine 1.
- the cooling efficiency is also increased as the amount of air blown by the electric cooling fan 19 is increased to increase the amount of heat exchange at the radiator 18 between the coolant and the external air.
- the cooling control apparatus includes an electronic control unit (ECU) 21, which controls various types of on-board equipment such as the engine 1 in the automobile.
- the ECU 21, which functions as a control section and a setting section, includes a CPU, which executes various types of computation processes related to control of the various types of on-board equipment, a ROM, which stores programs and data required for the control, a RAM, which temporarily stores computation results of the CPU and the like, and input/output ports for outputting and receiving signals to and from external devices.
- ECU electronice control unit
- the ECU 21 which functions as a control section and a setting section, includes a CPU, which executes various types of computation processes related to control of the various types of on-board equipment, a ROM, which stores programs and data required for the control, a RAM, which temporarily stores computation results of the CPU and the like, and input/output ports for outputting and receiving signals to and from external devices.
- various types of sensors such as a gas pedal position sensor 22, which detects the gas pedal depression amount, a vehicle speed sensor 23, which detects the speed of the automobile, and a coolant temperature sensor 26, which detects the coolant temperature in the circulation passage 16, are connected to the input ports of the ECU 21.
- a brake switch 24, which detects whether the brake pedal is being depressed, and an ignition switch 25 are connected to the input ports of the ECU 21.
- the ignition switch 25 is switched by a driver of the automobile among four switching positions including "OFF”, “ACCESSORY”, “ON”, and “STAR”, and outputs a signal corresponding to the current switching position.
- Drive circuits for driving the fuel injection valve 2, the electric water pump 17, the electric cooling fan 19, and the starter 15 are connected to the output ports of the ECU 21.
- the ECU 21 outputs command signals to the drive circuits of the devices connected to the output ports in accordance with the operating condition of the automobile and the engine 1 acquired by detection signals input from the sensors. In this manner, the ECU 21 performs various controls such as control of fuel injection from the fuel injection valves 2, drive control of the starter 15 at the starting of the engine, automatic stop and restart control of the engine 1, and drive control of the electric water pump 17 and the electric cooling fan 19.
- the ECU 21 cools the engine 1, for example, as follows through drive control of the electric water pump 17 and the electric cooling fan 19. That is, during normal combustion operation of the engine 1, the coolant temperature in the circulation passage 16 detected by the coolant temperature sensor 26 is used as a value corresponding to the engine temperature, and the electric water pump 17 and the electric cooling fan 19 are controlled such that the coolant temperature becomes less than or equal to a target value (for example, 95°C). When the coolant temperature becomes less than or equal to the target value, the electric water pump 17 and the electric cooling fan 19 are stopped. Thus, the engine 1 is appropriately cooled during normal combustion operation of the engine 1, and the engine temperature is prevented from being excessively increased.
- a target value for example, 95°C
- Such starting and stopping of the engine 1 is performed based on manipulation of the ignition switch 25 by the driver. Also, besides this, for the purpose of improving the fuel efficiency of the engine 1, the engine 1 is automatically stopped and restarted in accordance with the output demand of the engine 1.
- the procedure for starting and stopping the engine 1 will be described separately in [Starting and stopping based on manipulation of the ignition switch 25] and [Automatic stopping and restarting based on existence of engine output demand].
- a start command of the engine 1 is generated. Based on the start command, the starter 15 is driven, and cranking of the engine 1 is started. During the cranking, fuel is injected from the fuel injection valves 2 to the combustion chambers 3. Then, when fuel is burned in the combustion chambers 3 and the self-sustaining operation of the engine 1 is started, the engine 1 is automatically restarted.
- starting of the engine 1 is performed by manipulation of the ignition switch 25, or performed automatically in accordance with the output demand of the engine 1, it is desired that starting of the engine be completed at an early stage after the initiation of starting of the engine.
- fuel is burned in the cylinder in which the first compression stroke is performed after the initiation of starting of the engine, and the initial explosion after the initiation of starting of the engine is performed during the compression stroke.
- the fuel injection manner and the fuel combustion manner in the first to fourth cylinders of the engine 1 after stopping of the engine 1 is initiated until after the subsequent starting of the engine is initiated are shown in (a) in Fig. 2 .
- the fuel in the combustion chamber 3 is burned, and the initial explosion after the initiation of starting of the engine takes place.
- the engine 1 performs self-sustaining operation at the early stage after the initiation of starting of the engine 1.
- the cylinder in which the compression stroke takes place for the first time after the initiation of starting of the engine 1 is referred to as a "initial explosion cylinder" when necessary.
- cooling of the engine 1 by the above-mentioned cooling apparatus is executed not only during the normal combustion operation, but also at and after the completion of stopping of the engine 1. More specifically, as shown in (b) in Fig. 2 , at and after the completion of stopping of the engine 1 (time T1 and thereafter), and when the coolant temperature in the circulation passage 16 representing the temperature of the engine 1 is greater than or equal to a predetermined threshold value, the electric water pump 17 is driven as shown (c) in Fig. 2 , and the electric cooling fan 19 is driven as shown in (d) in Fig. 2 . Thus, the engine 1 is cooled, which suppresses the occurrence of pre-ignition during the first compression stroke after the subsequent initiation of starting of the engine. Thereafter, when the coolant temperature becomes less than the threshold value (time T2), the electric water pump 17 and the electric cooling fan 19 are stopped, and cooling of the engine 1 by the cooling apparatus is stopped.
- the possibility of the occurrence of pre-ignition in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the first time after the initiation of starting of the engine 1 is changed in accordance with the position of the piston 4 in the initial explosion cylinder at the completion of stopping of the engine 1 immediately before the starting of the initiation of the engine 1. That is, when the position of the piston 4 in the initial explosion cylinder is at the bottom dead center as shown in Fig. 3(a) , the temperature of gas in the combustion chamber 3 and the pressure in the combustion chamber 3 during the first compression stroke are the highest. The possibility of the occurrence of the pre-ignition thus becomes the highest.
- the threshold value is too low for suppressing the pre-ignition reliably.
- the engine 1 is cooled by driving the cooling apparatus more than necessary. This results in wasting the electric power for driving the electric water pump 17 and the electric cooling fan 19.
- a drive stopping time point (time T2 in Fig. 2 ) of the electric water pump 17 and the electric cooling fan 19 is delayed, which causes the driver to feel uncomfortable.
- the threshold value is variably set in accordance with the crank angle at the completion of stopping of the engine 1. More specifically, when the crank angle at the completion of stopping of the engine 1 is a crank angle at which the position of the piston 4 in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the first time after the subsequent initiation of starting of the engine is at the bottom dead center, the threshold value is set to the lowest value, which is a value (coolant temperature) that reliably suppresses the occurrence of pre-ignition in the initial explosion cylinder at the subsequent initiation of starting of the engine.
- crank angle at the completion of stopping of the engine 1 is a crank angle at which the position of the piston 4 in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the first time after the subsequent initiation of starting of the engine is closer to the top dead center than the bottom dead center, the closer to the top dead center the position of the piston 4 provided by a crank angle, the more gradually the threshold value is set to a higher value.
- Fig. 4 shows the relationship between the above-mentioned threshold value and the position of the piston 4 at the completion of stopping of the engine in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the first time after the subsequent initiation of starting of the engine. That is, when the position of the piston 4 in the initial explosion cylinder is at the bottom dead center, the threshold value takes a low value that reliably suppresses pre-ignition in the initial explosion cylinder at the subsequent starting of the engine. Also, when the position of the piston 4 in the initial explosion cylinder is closer to the top dead center than the bottom dead center, the closer to the top dead center the position of the piston 4, the more gradually the threshold value is changed to a higher value.
- the threshold value does not take a value that is too low for reliably suppressing the occurrence of pre-ignition in the initial explosion cylinder at the subsequent starting of the engine. Also, at and after the completion of stopping of the engine 1, the engine 1 is prevented from being cooled more than necessary by the cooling apparatus.
- the engine 1 is suppressed from being cooled more than necessary by the cooling apparatus while the engine is stopped, thus avoiding the occurrence of the above-mentioned problem.
- the procedure for controlling the cooling apparatus will now be described with reference to the flowchart of Fig. 5 showing a cooling control routine .
- the cooling control routine is periodically executed by the ECU 21 in an interrupting manner, for example, at predetermined time intervals.
- step S101 the ECU 21 determines whether it is the time when stopping of the engine 1 is completed, and if it is determined that it is the time when stopping of the engine 1 is completed, the ECU 21 proceeds to step S102.
- step S102 the ECU 21 detects the crank angle at the completion of stopping of the engine based on the signals from the crank position sensors 11, 12 and the cam position sensor 14, and sets the threshold value based on the crank angle.
- step S103 the ECU 21 determines whether the engine 1 is stopped. If the decision outcome is negative, the engine 1 is in the normal combustion operation. In this case, the ECU 21 proceeds to step S109, and executes the normal cooling control, that is, the electric water pump 17 and the electric cooling fan 19 are controlled such that the coolant temperature becomes less than or equal to the target value (95°C in this embodiment).
- step S103 If the decision outcome of step S103 is positive, it is the time when stopping of the engine 1 is completed or the engine 1 is in the stopped state after stopping of the engine 1 is completed. In this case, on conditions that the coolant temperature is greater than or equal to the threshold value (S104: YES), and that the reserves of power of the battery 20, which is the battery remaining amount, is greater than or equal to the lower limit value (S105: YES), the ECU 21 executes processes for driving the cooling apparatus while the engine is stopped (S106, S107). The battery remaining amount is obtained based on the charged capacity of the battery 20 by a generator mounted on the automobile, and the discharged capacity from the battery 20 when operating electric devices mounted on the automobile.
- the processes for driving the cooling apparatus when the engine is stopped include the process of step S106 for calculating the temperature difference between the threshold value and the coolant temperature, and the process of step S107 for controlling the flow rate of the electric water pump 17 and the blowing amount of the electric cooling fan 19 in accordance with the temperature difference. More specifically, as the temperature difference is increased, the electric water pump 17 is controlled such that the flow rate of the pump 17 is more gradually increased as shown in Fig. 6 , and the electric cooling fan 19 is controlled such that the blowing amount of the fan 19 is more gradually increased as shown in Fig. 7 .
- the cooling of the engine 1 by the coolant while the engine is stopped is performed more intensely as the coolant temperature is increased with respect to the threshold value, and is performed more weakly as the coolant temperature approaches the threshold value.
- step S104 As a result of cooling the engine 1 with the coolant, when the coolant temperature becomes less than the threshold value in step S104, the ECU 21 proceeds to step S108, and stops driving the electric water pump 17 and the electric cooling fan 19.
- the first embodiment has the following advantages.
- the temperature of gas in the combustion chamber 3 and the pressure in the combustion chamber 3 are also high as compared to those when the engine 1 is in the normal combustion operation for the reasons described in [BACKGROUND ART] .
- pre-ignition might occur in the combustion chamber 3.
- the cooling apparatus is driven such that the coolant temperature of the engine 1 becomes less than the threshold value as shown in Fig. 8 at and after the completion of stopping of the engine 1.
- the threshold value is set in accordance with the crank angle at the completion of stopping of the engine 1 so that, while reliably suppressing the occurrence of pre-ignition at the initiation of starting of the engine, the engine 1 is suppressed from being cooled more than necessary by the cooling apparatus while the engine is stopped.
- the threshold value is set to the lowest value and a value (coolant temperature) that reliably suppresses the occurrence of pre-ignition in the initial explosion cylinder at the subsequent initiation of starting of the engine. This is because when the position of the piston 4 in the initial explosion cylinder is closest to the bottom dead center as shown in Fig. 9(a) , the temperature of gas in the combustion chamber 3 and the pressure in the combustion chamber 3 during the second compression stroke are the highest, and thus the possibility for the pre-ignition to occur is the highest.
- crank angle at the completion of stopping of the engine 1 is a crank angle at which the position of the piston 4 in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the second time after the subsequent initiation of starting of the engine is closer to the top dead center as shown in Fig. 9(b) than the position closest to the bottom dead center ( Fig. 9 (a) ), the closer to the top dead center the position of the piston 4 provided by a crank angle, the more gradually the threshold value is set to a higher value.
- the crank angle at the completion of stopping of the engine 1 is a crank angle at which the position of the piston 4 in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the second time after the subsequent initiation of starting of the engine is closer to the top dead center as shown in Fig. 9(b) than the position closest to the bottom dead center ( Fig. 9 (a) )
- the closer to the top dead center the position of the piston 4 the lower the temperature of gas in the combustion chamber 3 and the pressure in the
- Fig. 10 shows the relationship between the threshold value and the position of the piston 4 at the completion of stopping of the engine in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the second time after the subsequent initiation of starting of the engine. That is, when the position of the piston 4 in the initial explosion cylinder is the closest to the bottom dead center, the threshold value takes a low value that reliably suppresses pre-ignition in the initial explosion cylinder at the subsequent starting of the engine. Also, when the position of the piston 4 in the initial explosion cylinder is at the position closer to the top dead center than the position closest to the bottom dead center, the closer to the top dead center the position of the piston 4, the more gradually the threshold value is changed to a higher value.
- the threshold value does not become a value that is too low for reliably suppressing the occurrence of pre-ignition in the initial explosion cylinder at the subsequent starting of the engine, and the engine 1 is prevented from being cooled more than necessary by the cooling apparatus at and after completion of stopping of the engine 1.
- the second embodiment has the following advantages.
- the threshold value is linearly changed as shown in Fig. 4 .
- the threshold value may be changed stepwise.
- the threshold value may be changed in two steps as shown in Fig. 11 , or may be changed in three or more steps.
- the advantage equivalent to the advantage (1) of the first embodiment is obtained. If the threshold value is linearly changed as in the first embodiment, the engine 1 is suppressed from being cooled more than necessary while the engine 1 is stopped, and the occurrence of pre-ignition is suppressed at the subsequent initiation of starting of the engine 1 in a more suitable manner.
- the threshold value is changed linearly as shown in Fig. 10 .
- the threshold value may be changed stepwise.
- the threshold value may be changed in two steps as shown in Fig. 12 , or may be changed in three or more steps.
- the advantage equivalent to the advantage (4) of the second embodiment is obtained. If the threshold value is linearly changed as in the second embodiment, the engine 1 is suppressed from being cooled more than necessary while the engine 1 is stopped, and the occurrence of pre-ignition is suppressed at the subsequent initiation of starting of the engine 1 in a more suitable manner.
- the flow rate of the electric water pump 17 while the engine 1 is stopped does not need to be changed gradually in accordance with the temperature difference between the threshold value and the coolant temperature as shown in Fig. 6 , but may be changed stepwise in accordance with the temperature difference.
- the flow rate of the electric water pump 17 may be fixed.
- the blowing amount of the electric cooling fan 19 while the engine 1 is stopped also does not need to be changed gradually in accordance with the temperature difference as shown in Fig. 7 , but may be changed stepwise in accordance with the temperature difference.
- the blowing amount of the electric cooling fan 19 may be fixed.
- the coolant temperature in the circulation passage 16 is used. Instead, other parameters such as the lubricant temperature of the engine 1 may be used.
- the present invention is applied to the engine 1 that automatically stops and restarts in accordance with the output demand, but the present invention may be applied to an engine that is stopped and started only by the ignition switch 25 manipulated by the driver.
- the present invention is applied to the direct injection engine 1 that injects fuel in the combustion chambers 3, but the present invention may be applied to a port injection engine that injects fuel in intake ports.
- the present invention may be applied to an engine other than four-cylinder engine such as an in-line six-cylinder engine, a V6 engine, and a V8 engine.
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Description
- The present invention relates to a cooling control apparatus of an internal combustion engine.
- Internal combustion engines mounted on vehicles such as automobiles are desired to complete startup within a short period of time. To respond to such a demand, a typical internal combustion engine first burns fuel in a cylinder in which the first compression stroke after the initiation of starting of the engine takes place or in a cylinder in which the second compression stroke after the initiation of starting of the engine takes place, so that the initial explosion after the initiation of starting of the engine takes place during the compression stroke.
- In the internal combustion engine, due to the pressure in the combustion chambers of the cylinders, the cylinders are respectively stopped at initial stages of an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke. Therefore, at the completion of stopping of the engine, the cylinder in which the first compression stroke takes place after subsequent the initiation of starting of the engine is the cylinder that is stopped at the initial stage of the compression stroke, and the cylinder in which the second compression stroke takes place after subsequent the initiation of starting of the engine is the cylinder that is stopped at the initial stage of the intake stroke.
- Since the cylinder in which the first compression stroke after starting of the engine takes place and the cylinder in which the second compression stroke after the initiation of starting of the engine takes place are respectively in the initial stage of the compression stroke and the initial stage of the intake stroke while the engine is stopped, gas that has remained in the combustion chambers while the engine has been stopped is compressed after the initiation of starting of the engine. If the engine is started without taking enough time for cooling after stopping of the engine is completed, the first compression stroke and the second compression stroke take place in a state where the temperature of gas in the combustion chambers are increased by the heat of the engine. Thus, during those compression strokes, the temperature of gas in the combustion chambers is high. This might cause self-ignition (pre-ignition) of the fuel in the combustion chambers. In particular, in the internal combustion engine that automatically stops and restarts combustion operation in accordance with, for example, the travelling state of a vehicle to improve the fuel efficiency, the engine is often restarted without taking enough time for cooling after stopping of the engine. Thus, there is more possibility for the above-mentioned pre-ignition to occur.
- In any cylinder in which the third or later compression stroke after the initiation of starting of the engine takes place, cool air that is drawn into the combustion chamber from an intake passage is compressed during the compression stroke. Thus, during the compression stroke, the temperature of gas in the combustion chamber does not become excessively high, and the possibility for the pre-ignition to occur is low.
- Also, it has been found that at the first compression stroke and the second compression stroke after the initiation of starting of the engine, the pressure in the combustion chambers are higher than that during the compression stroke when the engine is in the normal combustion operation. This is also the cause of pre-ignition. Hereinafter, reasons for the pressure in the combustion chambers to become high during the first compression stroke and the second compression stroke after the initiation of starting of the engine will be explained.
- During normal combustion operation of the internal combustion engine before being stopped, that is, when the engine is idling, while the piston moves in a direction to expand the combustion chamber in the intake stroke and the intake valve is openad, the pressure in the combustion chamber takes a lower value (negative pressure) than the atmospheric pressure, and air is drawn in from the intake passage to the combustion chamber. After that, the intake valve is closed while the piston moves in the direction to expand the combustion chamber, and the piston shifts to the compression stroke. Thus, during the intake stroke and the initial stage of the compression stroke, the pressure in the combustion chamber takes a lower value (negative pressure) than the atmospheric pressure. Therefore, in the cylinder that is stopped at the initial stage of the compression stroke and the cylinder that is stopped at the initial stage of the intake stroke at the completion of stopping of the engine, the pressure in the combustion chamber takes a lower value than the atmospheric pressure.
- However, after a certain period of time (for example, 1 or 2 seconds) has passed after stopping of the engine is completed, gas enters the combustion chambers from around valves and around the piston rings of the engine, and the pressure in the combustion chambers increases from the negative pressure to the atmospheric pressure. When starting of the engine is initiated in this state, and gas in the combustion chambers is started to be compressed in the cylinder that is at the initial stage of the compression stroke and in the cylinder that is at the initial stage of the intake stroke, since, at that time, the pressure in the combustion chambers has been increased to the atmospheric pressure, the pressure in the combustion chambers after starting compression is higher than that when the engine is in the normal combustion operation.
- As described above, in the engine in which the initial explosion takes place at the first compression stroke or the second compression stroke after starting of the engine is initiated, pre-ignition might occur if the engine is started without taking enough time for cooling after stopping of the engine is completed.
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Patent Document 1 discloses a cooling apparatus that is driven by a driving source different from the internal combustion engine and cools the engine with coolant. If the coolant temperature that takes a value corresponding to the engine temperature is higher than a predetermined value at the completion of stopping of the engine, the cooling apparatus is driven until the coolant temperature becomes less than the predetermined value while the engine is stopped. In this case, since the engine temperature is reduced while the engine is stopped by setting the predetermined value to a low value, pre-ignition is suppressed at the subsequent initiation of starting of the engine. However, to reliably suppress the pre-ignition, the predetermined value needs to be set appropriately. - That is, in the cylinder in which the initial explosion takes place after the subsequent initiation of starting of the engine, the closer to the bottom dead center the piston position in the cylinder when stopping of the engine is completed, the higher the temperature of gas and the pressure in the combustion chamber during the compression stroke in which the initial explosion takes place become. Thus, pre-ignition easily occurs. This is because, as the piston position in the cylinder at the completion of stopping of the engine becomes closer to the bottom dead center, the amount of gas that is heated in the combustion chamber while the engine is stopped is increased, and the negative pressure in the combustion chamber at the completion of stopping of the engine increased. This increases the amount of increase of the pressure in the combustion chamber to the atmospheric pressure that takes place until starting of the engine is initiated. Therefore, on the assumption that the piston position in the cylinder at the completion of stopping of the engine is closest to the bottom dead center, the predetermined value is set so as to reduce the engine temperature while the engine is stopped to a value at which pre-ignition does not occur when starting of the engine is initiated. In this manner, the pre-ignition the initiation of starting of the engine is reliably avoided.
- However, when the predetermined value is set as described above, if the piston position in the cylinder when stopping of the engine is completed is at a position closer to the top dead center than the position closest to the bottom dead center, the engine is cooled more than necessary in suppressing the occurrence of pre-ignition. This is because, when the piston position is at the position closer to the top dead center, the temperature of gas and the pressure in the combustion chamber is low during the compression stroke when the initial explosion takes place after the initiation of starting of the engine, compared to a case where the piston position is at the position closer to the bottom dead center. Thus the possibility for the pre-ignition to occur is reduced. If the engine is cooled more than necessary as described above, energy for driving the cooling apparatus is wasted, and the cooling apparatus is driven for a long time that is more than necessary while the engine is stopped, which causes a driver of the vehicle to feel uncomfortable.
Patent Document 1: Japanese Laid-Open Patent Publication No.2001-182580 US 6 986 331 B2 is also aiming to avoid pre-ignition. - Accordingly, it is an objective of the present invention to provide a cooling control apparatus of an internal combustion engine that, while suppressing pre-ignition at the initiation of starting of the engine, reliably suppresses the internal combustion engine from being cooled more than necessary while the engine is being stopped.
- To achieve the above objective, and in accordance with a first aspect of the present invention, a cooling control apparatus is provided that is applied to an internal combustion engine that includes cylinders provided with pistons, and in which initial explosion takes place in one of a first compression stroke and a second compression stroke after the initiation of starting of the engine. The cooling control apparatus includes a cooling apparatus, a control section, and a setting section. The cooling apparatus is driven by a driving source different from the engine and cools the engine. The control section drives the cooling apparatus at and after the completion of stopping of the engine and when the engine temperature is greater than or equal to a predetermined value that might cause pre-ignition at starting of the engine. The setting section sets the predetermined value in accordance with the crank angle at the completion of stopping of the engine. When the crank angle at the completion of stopping of the engine is a crank angle at which the piston position of the cylinder in which the initial explosion takes place after the subsequent initiation of starting of the engine is closer to the top dead center, the setting section sets the predetermined value to a value higher than that in a case where the crank angle at the completion of stopping of the engine is a crank angle at which the piston position of the cylinder in which the initial explosion takes place after the subsequent initiation of starting of the engine is closer to the bottom dead center.
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Fig. 1 is a schematic view illustrating the entire configuration of an engine and a cooling apparatus according to a first embodiment of the present invention; -
Fig. 2 is a time chart showing changes of strokes in a combustion cycle of the cylinders, changes of the coolant temperature, changes of the driving state of the electric water pump, and changes of the driving state of the electric cooling fan; -
Figs. 3(a) and 3(b) are schematic views showing piston positions at the completion of stopping of the engine in the cylinder in which the compression stroke takes place for the first time after the subsequent initiation of starting of the engine; -
Fig. 4 is a graph showing changes of a threshold value with respect to changes of the piston position at the completion of stopping of the engine; -
Fig. 5 is a flowchart showing the procedure for executing cooling control of the engine by the cooling apparatus; -
Fig. 6 is a graph showing changes of the flow rate of the electric water pump with respect to changes of the temperature difference between the coolant temperature and the threshold value; -
Fig. 7 is a graph showing changes of the blowing amount of the electric cooling fan with respect to changes of the temperature difference between the coolant temperature and the threshold value; -
Fig. 8 is a time chart showing changes of strokes in a combustion cycle of the cylinders, changes of the coolant temperature, changes of the driving state of the electric water pump, and changes of the driving state of the electric cooling fan according to a second embodiment of the present invention; -
Figs. 9(a) and 9(b) are schematic views showing piston positions at the completion of stopping of the engine in the cylinder in which the compression stroke takes place for the second time after the subsequent initiation of starting of the engine; -
Fig. 10 is a graph showing changes of the threshold value with respect to changes of the piston position at the completion of stopping of the engine; -
Fig. 11 is a graph showing changes of the threshold value with respect to changes of the piston position at the completion of stopping of the engine; and -
Fig. 12 is a graph showing changes of the threshold value with respect to changes of the piston position at the completion of stopping of the engine. - A first embodiment of the present invention will now be described with reference to
Figs. 1 to 7 . - An
engine 1 shown inFig. 1 is an in-line four-cylinder engine that is mounted on an automobile and is automatically stopped and restarted. In theengine 1, fuel is injected fromfuel injection valves 2 to correspondingcombustion chambers 3 during operation. By combustion of fuel in thecombustion chambers 3,pistons 4 reciprocate, thereby rotating a crankshaft 5, which is an output shaft of theengine 1. The rotation of the crankshaft 5 is transmitted to a camshaft 6, for example, by a belt. The rotation of the camshaft 6 selectively opens and closes engine valves such asintake valves 7 andexhaust valves 8. During the operation of theengine 1, a combustion cycle including an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke is repeated. The intake stroke, compression stroke, expansion stroke, and exhaust stroke are performed in the order of a first cylinder, a third cylinder, a fourth cylinder, and a second cylinder (refer toFig. 2 ). When starting self-sustaining operation (combustion operation) of theengine 1 that is being stopped, fuel is injected from thefuel injection valves 2 to thecombustion chambers 3 in a state where the crankshaft 5 is forced to rotate (cranking) by driving astarter 15 coupled to the crankshaft 5. - Devices for acquiring the crank angle of the
engine 1 will now be described. - A rotor 9 made of a magnetic body is secured to the crankshaft 5 of the
engine 1, andprotrusions 9a are formed on the periphery of the rotor 9 at equal intervals in the circumferential direction. Also, two crankposition sensors protrusions 9a are output from thecrank position sensors position sensors protrusions 9a even when the rotation speed of the rotor 9 is extremely slow such as immediately before stopping of theengine 1 is completed. For example, magnetoresistive element (MRE) sensors are used. Also, the relative positions of thecrank position sensor 11 and the crankposition sensor 12 with respect to the circumferential direction of the rotor 9 are set such that the phases of the pulse signals output from thesensors - A
rotor 13 made of a magnetic body is secured also to the camshaft 6, andprotrusions 13a having different circumferential length from one another are formed on the periphery of therotor 13 at different intervals in the circumferential direction. Acam position sensor 14 is provided in the vicinity of therotor 13. When therotor 13 is rotated with the camshaft 6, signals corresponding to theprotrusions 13a of therotor 13 are output from thecam position sensor 14. As thecam position sensor 14, a device is used that can output pulse signals corresponding to theprotrusions 13a even when the rotation speed of therotor 13 is extremely slow such as immediately before stopping of theengine 1 is completed. For example, a magnetoresistive element (MRE) sensor that is the same as thecrank position sensors - Based on the pulse signals from the
crank position sensors cam position sensor 14, the crank angle of theengine 1 is acquired. Since, as thesensors protrusions rotors 9, 13 even immediately before stopping of theengine 1, are used, the crank angle is reliably acquired even immediately before stopping of theengine 1 is completed. Therefore, based on the pulse signals from thecrank position sensors cam position sensor 14, the crank angle of theengine 1 at the completion of stopping of theengine 1 is acquired. - The cooling apparatus for cooling the
engine 1 will now be described. - The cooling apparatus is provided with a
circulation passage 16 for letting a coolant to flow to theengine 1. Anelectric water pump 17 and a radiator 18 are provided in thecirculation passage 16, and anelectric cooling fan 19 is provided in the vicinity of the radiator 18. Theelectric water pump 17 and theelectric cooling fan 19 are driven by a motor through power supply from abattery 20 of the automobile, that is, by a driving source different from theengine 1. - When the
electric water pump 17 is driven, the coolant in thecirculation passage 16 starts to flow, and the coolant circulates in thecirculation passage 16 passing through the radiator 18 and theengine 1. The coolant is cooled by heat exchange with the external air when passing through the radiator 18. Also, when theelectric cooling fan 19 is driven and air is blown toward the radiator 18, heat exchange between the coolant and the external air at the radiator 18 is promoted. The coolant cooled by the radiator 18 draws heat by heat exchange with theengine 1 when passing through theengine 1, thereby cooling theengine 1. - The cooling efficiency of the
engine 1 by the cooling apparatus is increased as the flow rate of theelectric water pump 17 is increased to increase the amount of the coolant passing through theengine 1. The cooling efficiency is also increased as the amount of air blown by theelectric cooling fan 19 is increased to increase the amount of heat exchange at the radiator 18 between the coolant and the external air. - The electrical configuration of a cooling control apparatus that controls the cooling apparatus will now be described.
- The cooling control apparatus includes an electronic control unit (ECU) 21, which controls various types of on-board equipment such as the
engine 1 in the automobile. TheECU 21, which functions as a control section and a setting section, includes a CPU, which executes various types of computation processes related to control of the various types of on-board equipment, a ROM, which stores programs and data required for the control, a RAM, which temporarily stores computation results of the CPU and the like, and input/output ports for outputting and receiving signals to and from external devices. - In addition to the signals from the
crank position sensors cam position sensor 14, various types of sensors such as a gaspedal position sensor 22, which detects the gas pedal depression amount, avehicle speed sensor 23, which detects the speed of the automobile, and acoolant temperature sensor 26, which detects the coolant temperature in thecirculation passage 16, are connected to the input ports of theECU 21. Furthermore, abrake switch 24, which detects whether the brake pedal is being depressed, and anignition switch 25 are connected to the input ports of theECU 21. Theignition switch 25 is switched by a driver of the automobile among four switching positions including "OFF", "ACCESSORY", "ON", and "STAR", and outputs a signal corresponding to the current switching position. Drive circuits for driving thefuel injection valve 2, theelectric water pump 17, theelectric cooling fan 19, and thestarter 15 are connected to the output ports of theECU 21. - The
ECU 21 outputs command signals to the drive circuits of the devices connected to the output ports in accordance with the operating condition of the automobile and theengine 1 acquired by detection signals input from the sensors. In this manner, theECU 21 performs various controls such as control of fuel injection from thefuel injection valves 2, drive control of thestarter 15 at the starting of the engine, automatic stop and restart control of theengine 1, and drive control of theelectric water pump 17 and theelectric cooling fan 19. - The
ECU 21 cools theengine 1, for example, as follows through drive control of theelectric water pump 17 and theelectric cooling fan 19. That is, during normal combustion operation of theengine 1, the coolant temperature in thecirculation passage 16 detected by thecoolant temperature sensor 26 is used as a value corresponding to the engine temperature, and theelectric water pump 17 and theelectric cooling fan 19 are controlled such that the coolant temperature becomes less than or equal to a target value (for example, 95°C). When the coolant temperature becomes less than or equal to the target value, theelectric water pump 17 and theelectric cooling fan 19 are stopped. Thus, theengine 1 is appropriately cooled during normal combustion operation of theengine 1, and the engine temperature is prevented from being excessively increased. - Starting and stopping of the
engine 1 performed through drive control of thefuel injection valves 2 and thestarter 15 by theECU 21 will now be described. - Such starting and stopping of the
engine 1 is performed based on manipulation of theignition switch 25 by the driver. Also, besides this, for the purpose of improving the fuel efficiency of theengine 1, theengine 1 is automatically stopped and restarted in accordance with the output demand of theengine 1. Hereinafter, the procedure for starting and stopping theengine 1 will be described separately in [Starting and stopping based on manipulation of the ignition switch 25] and [Automatic stopping and restarting based on existence of engine output demand]. - While the
engine 1 is stopped, when theignition switch 25 is sequentially switched from "OFF" through "ACCESSORY" and "ON" to "STAR" by the driver, at the time when theswitch 25 is turned to "START", a start command for theengine 1 is generated. Based on the start command, thestarter 15 is driven and cranking of theengine 1 is started, and fuel is injected from thefuel injection valves 2 to thecombustion chambers 3 during the cranking. Then, when fuel is burned in thecombustion chambers 3 and theengine 1 performs self-sustaining operation, starting of theengine 1 is completed. Also, during operation of theengine 1, when theignition switch 25 is sequentially turned by the driver from "ON" through "ACCESSORY" to "OFF", at the time when theswitch 25 is turned to "ACCESSORY", a stop command of theengine 1 is generated. Based on the stop command, combustion of fuel in thecombustion chambers 3 is stopped, and stopping of theengine 1 is initiated. Thereafter, the engine rotation speed is reduced from the idling rotation speed to "0", and stopping of theengine 1 is completed. - During operation of the
engine 1, when there is no output demand of theengine 1, combustion of fuel in thecombustion chambers 3 is stopped, and theengine 1 is automatically stopped. The existence of the output demand to theengine 1 is determined based on whether conditions such as (A) the gas pedal depression amount is "0", (B) the brake pedal is depressed, and (C) the vehicle speed is less than a predetermined value "a" that is close to "0" are all satisfied. When all the conditions (A) to (C) are satisfied, there is no output demand to theengine 1, in other words, it is determined that theengine 1 does not need to be operated. Thus, a stop command for theengine 1 is generated, and theengine 1 is automatically stopped. If the output demand to theengine 1 is generated after theengine 1 is automatically stopped, that is, if any one or more of the conditions (A) to (C) are no longer satisfied, a start command of theengine 1 is generated. Based on the start command, thestarter 15 is driven, and cranking of theengine 1 is started. During the cranking, fuel is injected from thefuel injection valves 2 to thecombustion chambers 3. Then, when fuel is burned in thecombustion chambers 3 and the self-sustaining operation of theengine 1 is started, theengine 1 is automatically restarted. - In recent years, regardless of whether starting of the
engine 1 is performed by manipulation of theignition switch 25, or performed automatically in accordance with the output demand of theengine 1, it is desired that starting of the engine be completed at an early stage after the initiation of starting of the engine. To meet such demand, in theengine 1, fuel is burned in the cylinder in which the first compression stroke is performed after the initiation of starting of the engine, and the initial explosion after the initiation of starting of the engine is performed during the compression stroke. The fuel injection manner and the fuel combustion manner in the first to fourth cylinders of theengine 1 after stopping of theengine 1 is initiated until after the subsequent starting of the engine is initiated are shown in (a) inFig. 2 . - As apparent from the figure, fuel injection from the
fuel injection valves 2 to thecombustion chambers 3 is performed during the intake strokes, and fuel in thecombustion chambers 3 is burned in the subsequent compression strokes, and then the cylinders proceed to the expansion strokes. In the example of (a) inFig. 2 , after fuel injection from thefuel injection valve 2 to thecombustion chamber 3 is performed during the intake stroke of the first cylinder, stopping of theengine 1 is completed in a state where the first cylinder has proceeded to the compression stroke (time T1). Thereafter, when the start command of theengine 1 is generated (time T3), starting of theengine 1 is initiated. Then, in the first cylinder in which the compression stroke takes place for the first time after the initiation of starting of the engine, the fuel in thecombustion chamber 3 is burned, and the initial explosion after the initiation of starting of the engine takes place. Thus, when the initial explosion takes place in the cylinder in which the compression stroke takes place for the first time after the initiation of starting of theengine 1, theengine 1 performs self-sustaining operation at the early stage after the initiation of starting of theengine 1. Hereinafter, the cylinder in which the compression stroke takes place for the first time after the initiation of starting of theengine 1 is referred to as a "initial explosion cylinder" when necessary. - In the first compression stroke after the initiation of starting of the
engine 1, the temperature of gas in thecombustion chamber 3 and the pressure in thecombustion chamber 3 are higher than those in the normal combustion operation of theengine 1 for the reasons described in [BACKGROUND ART]. Therefore, in the cylinder in which the compression stroke takes place for the first time after the initiation of starting of the engine, self ignition (pre-ignition) of fuel in thecombustion chamber 3 might occur. - Therefore, cooling of the
engine 1 by the above-mentioned cooling apparatus is executed not only during the normal combustion operation, but also at and after the completion of stopping of theengine 1. More specifically, as shown in (b) inFig. 2 , at and after the completion of stopping of the engine 1 (time T1 and thereafter), and when the coolant temperature in thecirculation passage 16 representing the temperature of theengine 1 is greater than or equal to a predetermined threshold value, theelectric water pump 17 is driven as shown (c) inFig. 2 , and theelectric cooling fan 19 is driven as shown in (d) inFig. 2 . Thus, theengine 1 is cooled, which suppresses the occurrence of pre-ignition during the first compression stroke after the subsequent initiation of starting of the engine. Thereafter, when the coolant temperature becomes less than the threshold value (time T2), theelectric water pump 17 and theelectric cooling fan 19 are stopped, and cooling of theengine 1 by the cooling apparatus is stopped. - As described in [BACKGROUND ART), the possibility of the occurrence of pre-ignition in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the first time after the initiation of starting of the
engine 1 is changed in accordance with the position of thepiston 4 in the initial explosion cylinder at the completion of stopping of theengine 1 immediately before the starting of the initiation of theengine 1. That is, when the position of thepiston 4 in the initial explosion cylinder is at the bottom dead center as shown inFig. 3(a) , the temperature of gas in thecombustion chamber 3 and the pressure in thecombustion chamber 3 during the first compression stroke are the highest. The possibility of the occurrence of the pre-ignition thus becomes the highest. Also, when the position of thepiston 4 in the initial explosion cylinder is at the position closer to the top dead center than the bottom dead center as shown inFig. 3(b) , the closer to the top dead center the piston, the lower the temperature of gas in thecombustion chamber 3 and the pressure in thecombustion chamber 3 during the first compression stroke become. Accordingly, the possibility of the occurrence of the pre-ignition is gradually reduced. Therefore, by setting the threshold value to a low value so as to avoid the pre-ignition on the assumption that the position of thepiston 4 in the initial explosion cylinder is at the bottom dead center, the pre-ignition is reliably suppressed. - However, when the actual position of the
piston 4 of the initial explosion cylinder is closer to the top dead center than the bottom dead center, the threshold value is too low for suppressing the pre-ignition reliably. Thus, at and after the completion of stopping of theengine 1, theengine 1 is cooled by driving the cooling apparatus more than necessary. This results in wasting the electric power for driving theelectric water pump 17 and theelectric cooling fan 19. Furthermore, since it takes a long time to reduce the coolant temperature of theengine 1 to a value less than the threshold value, a drive stopping time point (time T2 inFig. 2 ) of theelectric water pump 17 and theelectric cooling fan 19 is delayed, which causes the driver to feel uncomfortable. - In the first embodiment, the threshold value is variably set in accordance with the crank angle at the completion of stopping of the
engine 1. More specifically, when the crank angle at the completion of stopping of theengine 1 is a crank angle at which the position of thepiston 4 in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the first time after the subsequent initiation of starting of the engine is at the bottom dead center, the threshold value is set to the lowest value, which is a value (coolant temperature) that reliably suppresses the occurrence of pre-ignition in the initial explosion cylinder at the subsequent initiation of starting of the engine. Also, when the crank angle at the completion of stopping of theengine 1 is a crank angle at which the position of thepiston 4 in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the first time after the subsequent initiation of starting of the engine is closer to the top dead center than the bottom dead center, the closer to the top dead center the position of thepiston 4 provided by a crank angle, the more gradually the threshold value is set to a higher value. -
Fig. 4 shows the relationship between the above-mentioned threshold value and the position of thepiston 4 at the completion of stopping of the engine in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the first time after the subsequent initiation of starting of the engine. That is, when the position of thepiston 4 in the initial explosion cylinder is at the bottom dead center, the threshold value takes a low value that reliably suppresses pre-ignition in the initial explosion cylinder at the subsequent starting of the engine. Also, when the position of thepiston 4 in the initial explosion cylinder is closer to the top dead center than the bottom dead center, the closer to the top dead center the position of thepiston 4, the more gradually the threshold value is changed to a higher value. Thus, the threshold value does not take a value that is too low for reliably suppressing the occurrence of pre-ignition in the initial explosion cylinder at the subsequent starting of the engine. Also, at and after the completion of stopping of theengine 1, theengine 1 is prevented from being cooled more than necessary by the cooling apparatus. - As described above, while reliably suppressing the occurrence of pre-ignition in the initial explosion cylinder at the subsequent starting of the engine, the
engine 1 is suppressed from being cooled more than necessary by the cooling apparatus while the engine is stopped, thus avoiding the occurrence of the above-mentioned problem. - The procedure for controlling the cooling apparatus will now be described with reference to the flowchart of
Fig. 5 showing a cooling control routine . The cooling control routine is periodically executed by theECU 21 in an interrupting manner, for example, at predetermined time intervals. - In step S101, the
ECU 21 determines whether it is the time when stopping of theengine 1 is completed, and if it is determined that it is the time when stopping of theengine 1 is completed, theECU 21 proceeds to step S102. In step S102, theECU 21 detects the crank angle at the completion of stopping of the engine based on the signals from thecrank position sensors cam position sensor 14, and sets the threshold value based on the crank angle. In subsequent step S103, theECU 21 determines whether theengine 1 is stopped. If the decision outcome is negative, theengine 1 is in the normal combustion operation. In this case, theECU 21 proceeds to step S109, and executes the normal cooling control, that is, theelectric water pump 17 and theelectric cooling fan 19 are controlled such that the coolant temperature becomes less than or equal to the target value (95°C in this embodiment). - If the decision outcome of step S103 is positive, it is the time when stopping of the
engine 1 is completed or theengine 1 is in the stopped state after stopping of theengine 1 is completed. In this case, on conditions that the coolant temperature is greater than or equal to the threshold value (S104: YES), and that the reserves of power of thebattery 20, which is the battery remaining amount, is greater than or equal to the lower limit value (S105: YES), theECU 21 executes processes for driving the cooling apparatus while the engine is stopped (S106, S107). The battery remaining amount is obtained based on the charged capacity of thebattery 20 by a generator mounted on the automobile, and the discharged capacity from thebattery 20 when operating electric devices mounted on the automobile. - The processes for driving the cooling apparatus when the engine is stopped include the process of step S106 for calculating the temperature difference between the threshold value and the coolant temperature, and the process of step S107 for controlling the flow rate of the
electric water pump 17 and the blowing amount of theelectric cooling fan 19 in accordance with the temperature difference. More specifically, as the temperature difference is increased, theelectric water pump 17 is controlled such that the flow rate of thepump 17 is more gradually increased as shown inFig. 6 , and theelectric cooling fan 19 is controlled such that the blowing amount of thefan 19 is more gradually increased as shown inFig. 7 . Thus, the cooling of theengine 1 by the coolant while the engine is stopped is performed more intensely as the coolant temperature is increased with respect to the threshold value, and is performed more weakly as the coolant temperature approaches the threshold value. - As a result of cooling the
engine 1 with the coolant, when the coolant temperature becomes less than the threshold value in step S104, theECU 21 proceeds to step S108, and stops driving theelectric water pump 17 and theelectric cooling fan 19. - The first embodiment has the following advantages.
- (1) When the crank angle at the completion of stopping of the
engine 1 is a crank angle at which thepiston 4 of the cylinder (initial explosion cylinder) in which the compression stroke takes place for the first time after the subsequent initiation of starting of the engine is at the bottom dead center, the occurrence of the pre-ignition is reliably suppressed since the threshold value is set to a coolant temperature (lower limit value) at which the pre-ignition does not occur in the initial explosion cylinder at the subsequent the initiation of starting of the engine. Furthermore, when the crank angle at the completion of stopping of theengine 1 is a crank angle at which the position of thepiston 4 of the cylinder in which the compression stroke takes place for the first time after the subsequent initiation of starting of the engine is closer to the top dead center than the bottom dead center, the closer to the top dead center the position of thepiston 4 provided by a crank angle, the higher the threshold value, which is higher than the above-mentioned lower limit value, becomes. Thus, while reliably suppressing the occurrence of the pre-ignition, the threshold value is suppressed from being too low for reliably suppressing the pre-ignition. This suppresses theengine 1 from being cooled more than necessary while theengine 1 is stopped. - (2) In the case of cooling the
engine 1 while it is stopped, the flow rate of theelectric water pump 17 and the blowing amount of theelectric cooling fan 19 are increased when the coolant temperature is higher than the threshold value. Also, the closer to the threshold value the coolant temperature, the more gradually the flow rate of theelectric water pump 17 and the blowing amount of theelectric cooling fan 19 are reduced. Thus, the cooling of theengine 1 while the engine is stopped is performed more intensely as the coolant temperature is increased with respect to the threshold value, and is weakened as the coolant temperature approaches the threshold value. Therefore, theelectric water pump 17 and the electric cooling fan are not driven wastefully, and the coolant temperature is promptly reduced to be less than the threshold value. - (3) The
engine 1, which automatically stops and restarts the combustion operation, is frequently started without enough time after being stopped, which increases the possibility for pre-ignition to occur at the initiation of starting of the engine. However, while reliably suppressing such occurrence of pre-ignition, theengine 1 that is stopped is suppressed from being cooled more than necessary. - A second embodiment of the present invention will now be described with reference to
Figs. 8 and10 . - In the second embodiment, to complete starting of the
engine 1 in a short period of time, fuel is burned in the cylinder in which the compression stroke takes place for the second time after the initiation of starting of the engine. During the compression stroke, the initial explosion after the initiation of starting of the engine takes place. - (a) in
Fig. 8 is a time chart showing the fuel injection manner and the fuel combustion manner of the first to fourth cylinders of theengine 1 according to the second embodiment from after the initiation of stopping of theengine 1 to after the subsequent initiation of starting of the engine. In the example of (a) inFig. 8 , in a state where the first cylinder has proceeded from the intake stroke to the compression stroke and the third cylinder has proceeded from the exhaust stroke to the intake stroke, the stopping of theengine 1 is completed (time T1). In the second embodiment, in the cylinder (first cylinder in (a) inFig. 8 ) in which the compression stroke takes place at the completion of stopping of theengine 1, fuel injection is not performed in the intake stroke immediately before stopping of the engine is completed. Subsequently, when the start command of theengine 1 is generated (time T3), starting of theengine 1 is initiated. Then, in the cylinder (third cylinder in (a) inFig. 8 ) in which the intake stroke takes place for the first time after the initiation of starting of the engine, fuel injection from thefuel injection valve 2 to thecombustion chamber 3 is performed. When the compression stroke takes place in the third cylinder, that is, when the second compression stroke takes place after the initiation of starting of the engine, the fuel in thecombustion chamber 3 of the third cylinder is burned, and the initial explosion after the initiation of starting of theengine 1 takes place. Hereinafter, the cylinder in which the compression stroke takes place for the second time after the initiation of starting of theengine 1 is referred to as an "initial explosion cylinder" when necessary. - During the second compression stroke after the initiation of starting of the
engine 1, the temperature of gas in thecombustion chamber 3 and the pressure in thecombustion chamber 3 are also high as compared to those when theengine 1 is in the normal combustion operation for the reasons described in [BACKGROUND ART] . Thus, even in the cylinder in which the compression stroke takes place for the second time after the initiation of starting of the engine, pre-ignition might occur in thecombustion chamber 3. To suppress the pre-ignition, the cooling apparatus is driven such that the coolant temperature of theengine 1 becomes less than the threshold value as shown inFig. 8 at and after the completion of stopping of theengine 1. - The threshold value is set in accordance with the crank angle at the completion of stopping of the
engine 1 so that, while reliably suppressing the occurrence of pre-ignition at the initiation of starting of the engine, theengine 1 is suppressed from being cooled more than necessary by the cooling apparatus while the engine is stopped. - More specifically, when the crank angle at the completion of stopping of the
engine 1 is a crank angle at which the position of thepiston 4 in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the second time after the subsequent initiation of starting of the engine is closest to the bottom dead center as shown inFig. 9(a) , the threshold value is set to the lowest value and a value (coolant temperature) that reliably suppresses the occurrence of pre-ignition in the initial explosion cylinder at the subsequent initiation of starting of the engine. This is because when the position of thepiston 4 in the initial explosion cylinder is closest to the bottom dead center as shown inFig. 9(a) , the temperature of gas in thecombustion chamber 3 and the pressure in thecombustion chamber 3 during the second compression stroke are the highest, and thus the possibility for the pre-ignition to occur is the highest. - Also, when the crank angle at the completion of stopping of the
engine 1 is a crank angle at which the position of thepiston 4 in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the second time after the subsequent initiation of starting of the engine is closer to the top dead center as shown inFig. 9(b) than the position closest to the bottom dead center (Fig. 9 (a) ), the closer to the top dead center the position of thepiston 4 provided by a crank angle, the more gradually the threshold value is set to a higher value. This is because, when the position of thepiston 4 is closer to the top dead center as shown inFig. 9(b) than the position closest to the bottom dead center (Fig. 9(a) ), the closer to the top dead center the position of thepiston 4, the lower the temperature of gas in thecombustion chamber 3 and the pressure in thecombustion chamber 3 during the second compression stroke become. Thus, the possibility for the pre-ignition to occur is gradually reduced. -
Fig. 10 shows the relationship between the threshold value and the position of thepiston 4 at the completion of stopping of the engine in the cylinder (initial explosion cylinder) in which the compression stroke takes place for the second time after the subsequent initiation of starting of the engine. That is, when the position of thepiston 4 in the initial explosion cylinder is the closest to the bottom dead center, the threshold value takes a low value that reliably suppresses pre-ignition in the initial explosion cylinder at the subsequent starting of the engine. Also, when the position of thepiston 4 in the initial explosion cylinder is at the position closer to the top dead center than the position closest to the bottom dead center, the closer to the top dead center the position of thepiston 4, the more gradually the threshold value is changed to a higher value. Thus, the threshold value does not become a value that is too low for reliably suppressing the occurrence of pre-ignition in the initial explosion cylinder at the subsequent starting of the engine, and theengine 1 is prevented from being cooled more than necessary by the cooling apparatus at and after completion of stopping of theengine 1. - The second embodiment has the following advantages.
- (4) When the crank angle of the
engine 1 at the completion of stopping of the engine is a crank angle at which thepiston 4 of the cylinder (initial explosion cylinder) in which the compression stroke takes place for the second time after the subsequent initiation of starting of the engine is closest to the bottom dead center, the threshold value is set to a coolant temperature (lower limit value) at which pre-ignition does not occur in the initial explosion cylinder at the subsequent initiation of starting of the engine. Thus, the occurrence of pre-ignition is reliably suppressed. Furthermore, when the crank angle of theengine 1 at the completion of stopping of the engine is a crank angle at which the position of thepiston 4 of the cylinder in which the compression stroke takes place for the second time after the subsequent initiation of starting of the engine is closer to the top dead center than the position closest to the bottom dead center, the closer to the top dead center the position of thepiston 4 provided by a crank angle, the higher the threshold value, which is higher than the lower limit value, becomes. Thus, while reliably suppressing the occurrence of the pre-ignition, the threshold value is suppressed from being too low for reliably suppressing the pre-ignition. This suppresses theengine 1 from being cooled more than necessary while theengine 1 is stopped. - (5) The advantages (2) and (3) of the first embodiment are obtained.
- The above embodiments may be modified as follows, for example.
- In the first embodiment, the threshold value is linearly changed as shown in
Fig. 4 . Instead, the threshold value may be changed stepwise. For example, the threshold value may be changed in two steps as shown inFig. 11 , or may be changed in three or more steps. In this case also, the advantage equivalent to the advantage (1) of the first embodiment is obtained. If the threshold value is linearly changed as in the first embodiment, theengine 1 is suppressed from being cooled more than necessary while theengine 1 is stopped, and the occurrence of pre-ignition is suppressed at the subsequent initiation of starting of theengine 1 in a more suitable manner. - In the second embodiment, the threshold value is changed linearly as shown in
Fig. 10 . Instead, the threshold value may be changed stepwise. For example, the threshold value may be changed in two steps as shown inFig. 12 , or may be changed in three or more steps. In this case also, the advantage equivalent to the advantage (4) of the second embodiment is obtained. If the threshold value is linearly changed as in the second embodiment, theengine 1 is suppressed from being cooled more than necessary while theengine 1 is stopped, and the occurrence of pre-ignition is suppressed at the subsequent initiation of starting of theengine 1 in a more suitable manner. - The flow rate of the
electric water pump 17 while theengine 1 is stopped does not need to be changed gradually in accordance with the temperature difference between the threshold value and the coolant temperature as shown inFig. 6 , but may be changed stepwise in accordance with the temperature difference. - The flow rate of the
electric water pump 17 may be fixed. - The blowing amount of the
electric cooling fan 19 while theengine 1 is stopped also does not need to be changed gradually in accordance with the temperature difference as shown inFig. 7 , but may be changed stepwise in accordance with the temperature difference. - The blowing amount of the
electric cooling fan 19 may be fixed. - As the parameter representing the temperature of the
engine 1, the coolant temperature in thecirculation passage 16 is used. Instead, other parameters such as the lubricant temperature of theengine 1 may be used. - The present invention is applied to the
engine 1 that automatically stops and restarts in accordance with the output demand, but the present invention may be applied to an engine that is stopped and started only by theignition switch 25 manipulated by the driver. - The present invention is applied to the
direct injection engine 1 that injects fuel in thecombustion chambers 3, but the present invention may be applied to a port injection engine that injects fuel in intake ports. - The present invention may be applied to an engine other than four-cylinder engine such as an in-line six-cylinder engine, a V6 engine, and a V8 engine.
Claims (5)
- A cooling control apparatus of an internal combustion engine that includes a plurality of cylinders provided with pistons, wherein initial explosion takes place in one of a first compression stroke and a second compression stroke after the initiation of starting of the engine, the cooling control apparatus comprising:a cooling apparatus, which is driven by a driving source different from the engine and cools the engine;a control section, which drives the cooling apparatus at and after the completion of stopping of the engine and when the engine temperature is greater than or equal to a predetermined value that might cause pre-ignition at the initiation of starting of the engine; characterised in that it further comprises a setting section, which sets the predetermined value in accordance with the crank angle at the completion of stopping of the engine, wherein, when the crank angle at the completion of stopping of the engine is a crank angle at which the piston position of the cylinder in which the initial explosion takes place after the subsequent initiation of starting of the engine is closer to the top dead center, the setting section sets the predetermined value to a value higher than that in a case where the crank angle at the completion of stopping of the engine is a crank angle at which the piston position of the cylinder in which the initial explosion takes place after the subsequent initiation of starting of the engine is closer to the bottom dead center.
- The cooling control apparatus according to claim 1, wherein the closer to the top dead center the position of the piston, which is provided by the crank angle at the completion of stopping of the engine, in the cylinder in which the initial explosion takes place after the subsequent initiation of starting of the engine, the more gradually setting section sets the predetermined value to a higher value.
- The cooling control apparatus according to claim 1 or 2, wherein the cooling apparatus includes an electric pump, which supplies a coolant to the engine, and the control section increases the flow rate of the electric pump as the engine temperature increases with respect to the predetermined value.
- The cooling control apparatus according to claim 1 or 2, wherein the cooling apparatus includes an electric pump, which circulates a coolant to pass through the engine, and an electric fan, which cools the coolant by blowing air, and wherein the control section increases the blowing amount of the electric fan as the engine temperature increases with respect to the predetermined value.
- The cooling control apparatus according to any one of claims 1 to 4, wherein combustion operation of the engine is automatically stopped when automatic stop conditions are satisfied while the combustion operation is being executed, and the combustion operation is automatically restarted when automatic restart conditions are satisfied while the combustion operation is stopped.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006190205A JP4327826B2 (en) | 2006-07-11 | 2006-07-11 | Cooling control device for internal combustion engine |
PCT/JP2007/063791 WO2008007686A1 (en) | 2006-07-11 | 2007-07-11 | Cooling controller of internal combustion engine |
Publications (3)
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EP2045452A1 EP2045452A1 (en) | 2009-04-08 |
EP2045452A4 EP2045452A4 (en) | 2016-08-24 |
EP2045452B1 true EP2045452B1 (en) | 2017-10-25 |
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EP07790595.8A Expired - Fee Related EP2045452B1 (en) | 2006-07-11 | 2007-07-11 | Cooling controller of internal combustion engine |
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EP (1) | EP2045452B1 (en) |
JP (1) | JP4327826B2 (en) |
WO (1) | WO2008007686A1 (en) |
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FR2944235B1 (en) * | 2009-04-09 | 2012-10-19 | Renault Sas | COOLING DEVICE FOR MOTOR VEHICLE |
FR2944236B1 (en) | 2009-04-09 | 2012-10-19 | Renault Sas | COOLING DEVICE FOR MOTOR VEHICLE |
JP5381675B2 (en) * | 2009-12-14 | 2014-01-08 | トヨタ自動車株式会社 | Exhaust-driven supercharger cooling apparatus and internal combustion engine control apparatus having the same |
CN103174504B (en) * | 2010-03-03 | 2015-11-18 | 株式会社电装 | For the controller of engine-cooling system |
JP5834689B2 (en) * | 2011-09-22 | 2015-12-24 | マツダ株式会社 | Start control device for compression self-ignition engine |
JP5818610B2 (en) * | 2011-09-27 | 2015-11-18 | 株式会社クボタ | Work vehicle |
JP2013079040A (en) * | 2011-10-05 | 2013-05-02 | Kubota Corp | Riding type work vehicle |
US10458310B2 (en) * | 2012-02-06 | 2019-10-29 | Toyota Jidosha Kabushiki Kaisha | Control device for internal combustion engine |
JP5891925B2 (en) * | 2012-04-20 | 2016-03-23 | トヨタ自動車株式会社 | Cooling device for internal combustion engine |
US9828932B2 (en) * | 2013-03-08 | 2017-11-28 | GM Global Technology Operations LLC | System and method for controlling a cooling system of an engine equipped with a start-stop system |
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JP2526569B2 (en) * | 1987-03-05 | 1996-08-21 | トヨタ自動車株式会社 | Speed control method for cooling fan of internal combustion engine |
JP3772947B2 (en) * | 1999-03-18 | 2006-05-10 | 三菱自動車工業株式会社 | Starter for in-cylinder injection internal combustion engine |
JP3661762B2 (en) * | 1999-12-17 | 2005-06-22 | 三菱自動車工業株式会社 | Starter for in-cylinder injection internal combustion engine |
JP2001032714A (en) * | 1999-07-23 | 2001-02-06 | Honda Motor Co Ltd | Cooling control device for engine |
JP4274658B2 (en) | 1999-12-24 | 2009-06-10 | 富士重工業株式会社 | Engine idle control device |
JP3941441B2 (en) * | 2001-09-11 | 2007-07-04 | トヨタ自動車株式会社 | Control device for start of internal combustion engine |
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- 2006-07-11 JP JP2006190205A patent/JP4327826B2/en not_active Expired - Fee Related
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JP2008019733A (en) | 2008-01-31 |
WO2008007686A1 (en) | 2008-01-17 |
EP2045452A1 (en) | 2009-04-08 |
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